That's what I was trying to say; I'm in no way a panspermia fan. I was responding primarily to the line "perhaps DNA(+RNA) is the only molecule with the right properties to act as genetic material" with the notion that it was probably more special because it was first rather than something intrinsic about the DNA->RNA->ribosome system that made it inevitable. If we could roll the clock back 4.mumble billion years, we'd probably still get life that had a separation between code and structure, but what that code was and what that structure looked like might have been pretty different.